WO2012086180A1 - 発振装置および電子機器 - Google Patents

発振装置および電子機器 Download PDF

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Publication number
WO2012086180A1
WO2012086180A1 PCT/JP2011/007099 JP2011007099W WO2012086180A1 WO 2012086180 A1 WO2012086180 A1 WO 2012086180A1 JP 2011007099 W JP2011007099 W JP 2011007099W WO 2012086180 A1 WO2012086180 A1 WO 2012086180A1
Authority
WO
WIPO (PCT)
Prior art keywords
elastic member
oscillation device
piezoelectric element
electroacoustic transducer
oscillation
Prior art date
Application number
PCT/JP2011/007099
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
康晴 大西
岸波　雄一郎
重夫 佐藤
黒田　淳
行雄 村田
元喜 菰田
信弘 川嶋
内川　達也
Original Assignee
Ｎｅｃカシオモバイルコミュニケーションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｎｅｃカシオモバイルコミュニケーションズ株式会社 filed Critical Ｎｅｃカシオモバイルコミュニケーションズ株式会社
Priority to US13/990,904 priority Critical patent/US9306148B2/en
Priority to CN201180061418.8A priority patent/CN103262576B/zh
Priority to JP2012549633A priority patent/JP5954181B2/ja
Priority to EP11851313.4A priority patent/EP2658284A4/en
Publication of WO2012086180A1 publication Critical patent/WO2012086180A1/ja

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/88—Mounts; Supports; Enclosures; Casings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
    • H10N30/2047—Membrane type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2892—Mountings or supports for transducers
    • H04R1/2896—Mountings or supports for transducers for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the present invention relates to an oscillation device using a piezoelectric element and an electronic apparatus using the oscillation device.
  • Patent Document 1 proposes various proposals for the electroacoustic transducer as described above.
  • a piezoelectric element type electroacoustic transducer has a high mechanical quality factor because a highly rigid piezoelectric ceramic is used as a drive source.
  • a high sound pressure level can be secured in the vicinity of the fundamental resonance frequency, but there is a problem that the sound pressure level is attenuated in other bands. That is, there are peaks and valleys in the acoustic characteristics, and it is difficult to ensure a sufficient sound pressure level.
  • the piezoelectric electroacoustic transducer is influenced by a piezoelectric element having a high mechanical quality factor Q, its vibration state is a bent type.
  • the central part is large and the end part has a slight displacement distribution, which is disadvantageous in terms of volume exclusion compared to electrodynamic electroacoustic transducers that vibrate in the piston motion state, and the sound pressure level is also reduced. There was a problem.
  • the present invention has been made in view of the above-described problems, and provides a piezoelectric oscillation device capable of ensuring a sufficient sound pressure level, and an electronic device using such an oscillation device. is there.
  • the oscillation device includes at least one frame-shaped support frame, a flat elastic member supported on the outer periphery of the support frame, and at least one elastic member arranged on both sides of the elastic member to expand and contract by applying an electric field.
  • the center positions of the main surfaces of the piezoelectric elements located on both sides of the elastic member are different from each other.
  • the first electronic device of the present invention includes the oscillation device of the present invention and an oscillation drive unit that causes the oscillation device to output an ultrasonic wave demodulated into an audible sound wave.
  • a second electronic device includes an oscillation device according to the present invention, an oscillation drive unit that outputs an ultrasonic wave to the oscillation device, and an ultrasonic detection that detects an ultrasonic wave oscillated from the oscillation device and reflected from a measurement object. And a distance measuring unit that calculates a distance from the detected ultrasonic wave to the measurement object.
  • a plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.
  • FIG. 1 is a schematic longitudinal sectional front view showing an electroacoustic transducer 100 which is an oscillation device according to an embodiment of the present invention.
  • An electroacoustic transducer 100 which is an oscillation device of the present embodiment will be described below with reference to FIG.
  • the electroacoustic transducer 100 of the present embodiment includes a frame-shaped support frame 110, a flat elastic member 120 supported on the outer periphery of the support frame 110, and at least both surfaces of the elastic member 120. And at least two piezoelectric elements 130 that are arranged one by one and that expand and contract by application of an electric field.
  • the center positions of the main surfaces of the piezoelectric elements 130 located on both surfaces of the elastic member 120 are different from each other as described above. More specifically, the center of the main surface of the first piezoelectric element 130 located on one surface of the elastic member 120 overlaps the side surface of the second piezoelectric element 130 located on the other surface of the elastic member 120 in plan view. . The center of the second piezoelectric element 130 overlaps the side surface of the first piezoelectric element 130 in plan view.
  • the planar shape of the piezoelectric element 130 and the support frame 110 may be a circle or a square that is a rectangle (not shown).
  • electrode layers 131 are formed on the two main surfaces of the piezoelectric element 130 and are connected to a driver circuit 140 that is an oscillation drive unit. For this reason, the piezoelectric element 130 oscillates at a frequency in the ultrasonic band of 20 kHz or more.
  • the elastic member 120 is made of metal, but is insulated from the electrode layer 131 of the piezoelectric element 130. However, by making the electrode layer 131 and the elastic member 120 conductive, the elastic member 120 can be part of the wiring that connects the piezoelectric element 130 and the driver circuit.
  • the piezoelectric element 130 is made of a material having a piezoelectric effect.
  • the material constituting the piezoelectric element 130 is not particularly limited to both inorganic materials and organic materials.
  • materials such as lead zirconate titanate (PZT) and barium titanate (BaTiO 3 ), which are materials having high electromechanical conversion efficiency, are used.
  • PZT lead zirconate titanate
  • BaTiO 3 barium titanate
  • the thickness of the piezoelectric element 130 is not particularly limited, but is preferably 10 ⁇ m or more and 1 mm or less.
  • an electrode layer 131 is formed on the main surface in order to generate an electric field.
  • the material of the electrode layer 131 is not particularly limited, and for example, silver or silver / palladium can be used. Silver is used as a general-purpose electrode material with low resistance, and has advantages in manufacturing process and cost. Further, since silver / palladium is a low-resistance material excellent in oxidation resistance, there is an advantage from the viewpoint of reliability.
  • the thickness of the electrode layer 131 is not particularly limited, but the thickness is preferably 1 ⁇ m or more and 50 ⁇ m or less. When the thickness of the electrode layer 131 is less than 1 ⁇ m, it is difficult to form the electrode layer uniformly because the film thickness is small. For this reason, conversion efficiency may fall. Further, when the film thickness of the electrode layer 131 exceeds 50 ⁇ m, there is no particular problem in manufacturing, but the electrode layer 131 becomes a constraining surface with respect to the ceramic material of the piezoelectric element 130 and reduces the energy conversion efficiency. There is a point.
  • the elastic member 120 a material having a high elastic modulus with respect to a ceramic that is a brittle material, such as metal or resin, can be used.
  • a general-purpose material such as phosphor bronze or stainless steel is used from the viewpoint of workability and cost.
  • the thickness of the elastic member 120 is preferably 5 ⁇ m or more and 1000 ⁇ m or less. When the thickness of the elastic member 120 is less than 5 ⁇ m, the mechanical strength is weak, so that the function as a restraining member is impaired, and the mechanical vibration characteristics of the vibrators vary between production lots due to a decrease in processing accuracy. This can cause problems.
  • the mechanism of sound wave generation uses a stretching motion generated by applying an electric field to the piezoelectric element 130. Moreover, the frequency of an ultrasonic wave is limited to 20 kHz or more. Since the piezoelectric element 130 has a high mechanical quality factor Q, energy is concentrated in the vicinity of the basic resonance. For this reason, although a high sound pressure level can be obtained at the fundamental resonance frequency, the sound pressure is attenuated in other frequency bands.
  • the electroacoustic transducer 100 since the electroacoustic transducer 100 according to the present embodiment oscillates ultrasonic waves limited to a specific frequency, it is rather advantageous that the mechanical quality factor Q of the piezoelectric element 130 is high. Further, since the basic resonance frequency of the piezoelectric vibrator is affected by the shape of the piezoelectric element 130, when the resonance frequency is adjusted to a high frequency band, for example, an ultrasonic band, it is advantageous for miniaturization.
  • the electroacoustic transducer 100 oscillates an FM (Frequency Modulation) or AM (Amplitude Modulation) modulated ultrasonic wave, and uses a non-linear state (dense state) of air to generate a modulated wave. Sound reproduction is performed based on the principle of a so-called parametric speaker that demodulates and reproduces audible sound.
  • the piezoelectric element 130 has a configuration limited to oscillation in a high frequency band, and thus can be miniaturized.
  • the piezoelectric electroacoustic transducer 100 of the present configuration is different from a general bimorph structure in that the central positions of the main surfaces of the piezoelectric elements 130 positioned on both surfaces of the elastic member 120 are mutually different. It is different. That is, the center position of the main surface of the first piezoelectric element 130 located on one surface of the elastic member 120 overlaps with the side surface of the second piezoelectric element 130 located on the other surface in plan view, and the second piezoelectric element 130. Is overlapped with the side surface of the first piezoelectric element 130 in plan view.
  • the two piezoelectric elements 130 are asymmetrically arranged on the electroacoustic transducer 100 in the vertical direction. As a result, uniformity and periodicity within the vibration plane are lost, and vibration degeneration can be prevented. Therefore, a large number of vibration modes can be created.
  • the anti-phase vibration mode is formed around the electroacoustic transducer 100.
  • the centers of the plurality of piezoelectric elements 130 do not match. In this case, the rigidity of the central portion of the electroacoustic transducer 100 is enhanced. Therefore, it is possible to suppress an increase in the reverse-phase vibration.
  • the operation principle of the electroacoustic transducer 100 uses the expansion and contraction motion that occurs when an electric field is applied to the piezoelectric element 130.
  • the oscillation frequency is preferably an ultrasonic band of 20 kHz or more.
  • the piezoelectric element 130 can be reduced in size, and at the same time, directivity can be controlled using the straightness of the ultrasonic wave.
  • the present invention can also be used for a parametric speaker in which an audio signal is conveyed to an ultrasonic wave and demodulated in the air.
  • FIG. 2 is a schematic longitudinal sectional front view showing a structure of an electroacoustic transducer 200 which is an oscillation device of one modification.
  • the elastic member 120 is made of metal.
  • the elastic member 120 may be made of resin.
  • the elastic member 120 is made of, for example, a polymer material having a longitudinal elastic modulus of 100 GPa or less.
  • the elastic member 120 for example, polyethylene terephthalate, polyethylene, urethane, silicon rubber, natural rubber, or synthetic rubber can be used from the viewpoint of versatility.
  • the thickness of the elastic member 120 is preferably 5 ⁇ m or more and 1000 ⁇ m or less. When the thickness exceeds 1000 ⁇ m, there is a problem in that the restraint on the piezoelectric element 130 due to the increase in rigidity is strengthened, and the vibration displacement amount is attenuated. Moreover, it is preferable that the elastic member 120 of this embodiment has a longitudinal elastic modulus, which is an index indicating the rigidity of the material, of 1 GPa or more and 500 GPa or less. When the rigidity of the elastic member 120 is excessively low or excessively high, there is a problem that characteristics and reliability are impaired as a mechanical vibrator.
  • the end of the vibrating surface where stress concentrates during vibration is composed of a flexible elastic member 120 made of resin. That is, since the impact energy at the time of dropping can be absorbed by the elastic member 120 made of resin, the dropping strength can be improved.
  • the end portion between the support frame 110 and the piezoelectric element 130 is formed of the resin of the elastic member 120.
  • the flexible elastic resin member 120 is positioned at the vibration end, so that the movable range of the end is expanded.
  • the vibration state becomes closer to a piston shape, and the volume exclusion amount at the time of vibration increases. Since the sound pressure level depends on the volume exclusion amount to the air at the time of vibration, the electroacoustic transducer 200 of this configuration can realize superior characteristics.
  • FIG. 3 is a schematic longitudinal sectional front view showing a structure of an electroacoustic transducer 300 which is an oscillation device of another modification.
  • the configuration in which one piezoelectric element 130 is arranged on each side of the elastic member 120 is illustrated.
  • a plurality of piezoelectric elements 130 may be disposed on one surface or both surfaces of the elastic member 120.
  • the electroacoustic transducer 300 includes a first piezoelectric element 130 and a third piezoelectric element 130 arranged on one surface of the elastic member 120, and a second electrode arranged on the other surface of the elastic member 120.
  • the piezoelectric element 130 is provided.
  • the first piezoelectric element 130, the third piezoelectric element 130, and the second piezoelectric element 130 are different from each other in the center position of the main surface. Also in this modification, the effect similar to the electroacoustic transducer 100 which concerns on the form mentioned above can be acquired.
  • an electronic device in which the electroacoustic transducer 100 is connected to the driver circuit 140 that is an oscillation drive unit is assumed.
  • an electroacoustic transducer 100, an oscillation drive unit that outputs an ultrasonic wave to the electroacoustic transducer 100, and an ultrasonic wave that is detected from the ultrasonic wave that is oscillated from the electroacoustic transducer 100 and reflected by the measurement object is assumed.
  • An electronic device such as a sonar that includes a detection unit and a distance measurement unit that calculates a distance from the detected ultrasonic wave to the measurement target can also be implemented.

Landscapes

  • Otolaryngology (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
PCT/JP2011/007099 2010-12-20 2011-12-20 発振装置および電子機器 WO2012086180A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/990,904 US9306148B2 (en) 2010-12-20 2011-12-20 Oscillator device and electronic apparatus
CN201180061418.8A CN103262576B (zh) 2010-12-20 2011-12-20 振荡器设备和电子装置
JP2012549633A JP5954181B2 (ja) 2010-12-20 2011-12-20 発振装置および電子機器
EP11851313.4A EP2658284A4 (en) 2010-12-20 2011-12-20 OSCILLATOR DEVICE AND ELECTRONIC INSTRUMENT

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010282666 2010-12-20
JP2010-282666 2010-12-20

Publications (1)

Publication Number Publication Date
WO2012086180A1 true WO2012086180A1 (ja) 2012-06-28

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PCT/JP2011/007099 WO2012086180A1 (ja) 2010-12-20 2011-12-20 発振装置および電子機器

Country Status (5)

Country Link
US (1) US9306148B2 (zh)
EP (1) EP2658284A4 (zh)
JP (1) JP5954181B2 (zh)
CN (1) CN103262576B (zh)
WO (1) WO2012086180A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014064204A (ja) * 2012-09-21 2014-04-10 Taiheiyo Cement Corp 超音波発音体およびパラメトリックスピーカ
CN104350766A (zh) * 2012-08-10 2015-02-11 京瓷株式会社 音响产生器、音响产生装置以及电子设备
CN106558301A (zh) * 2016-11-17 2017-04-05 哈尔滨工程大学 低频指向性水声换能器
JP2019147122A (ja) * 2018-02-28 2019-09-05 太陽誘電株式会社 振動発生装置及び電子機器

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EP2568720A4 (en) * 2010-07-23 2013-11-06 Nec Corp VIBRATING DEVICE AND ELECTRONIC DEVICE
FR3020231B1 (fr) * 2014-04-18 2016-05-06 Akoustic Arts Enceinte sonore unidirectionnelle
WO2017061991A1 (en) 2015-10-06 2017-04-13 Halliburton Energy Services, Inc. Acoustic logging tool utilizing fundamental resonance
CN113055791B (zh) * 2019-12-28 2022-10-28 荣耀终端有限公司 扬声器内核、扬声器模组及电子设备
KR20230145032A (ko) * 2022-04-07 2023-10-17 썬전 샥 컴퍼니 리미티드 음향출력장치

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JP2009151666A (ja) 2007-12-21 2009-07-09 Chugoku Electric Power Co Inc:The 顧客申出管理システム及び顧客申出管理方法

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See also references of EP2658284A4

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104350766A (zh) * 2012-08-10 2015-02-11 京瓷株式会社 音响产生器、音响产生装置以及电子设备
JP2014064204A (ja) * 2012-09-21 2014-04-10 Taiheiyo Cement Corp 超音波発音体およびパラメトリックスピーカ
CN106558301A (zh) * 2016-11-17 2017-04-05 哈尔滨工程大学 低频指向性水声换能器
JP2019147122A (ja) * 2018-02-28 2019-09-05 太陽誘電株式会社 振動発生装置及び電子機器
JP7055950B2 (ja) 2018-02-28 2022-04-19 太陽誘電株式会社 振動発生装置及び電子機器
US11557712B2 (en) 2018-02-28 2023-01-17 Taiyo Yuden Co., Ltd. Vibration generating device and electronic equipment

Also Published As

Publication number Publication date
CN103262576B (zh) 2016-12-28
US20130242702A1 (en) 2013-09-19
JPWO2012086180A1 (ja) 2014-05-22
EP2658284A1 (en) 2013-10-30
US9306148B2 (en) 2016-04-05
JP5954181B2 (ja) 2016-07-20
CN103262576A (zh) 2013-08-21
EP2658284A4 (en) 2014-06-11

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